public static void EnsureOnComplementIfContained <T>(this MyIterableComplementSet <T> self, T item)
{
if (self.Contains(item) && !self.IsInComplement(item))
{
self.MoveToComplement(item);
}
}
public static void AddOrEnsureOnComplement <T>(this MyIterableComplementSet <T> self, T item)
{
if (!self.Contains(item))
{
self.AddToComplement(item);
}
else if (!self.IsInComplement(item))
{
self.MoveToComplement(item);
}
}